* tools/dev/unix-build/Makefile.svn: Always clean pre-generated SWIG files    to avoid test failures due to incompatible SWIG versions. (This problem    only surfaces when testing release tarballs.)
* tools/dev/unix-build/Makefile.svn: Always clean pre-generated SWIG files
   to avoid test failures due to incompatible SWIG versions. (This problem
   only surfaces when testing release tarballs.)


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1176895 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion